<template>
  <div class="app">
    <h2>求和为：{{ sum }}</h2>
    <h2>名字为：{{ person.name }}</h2>
    <h2>年龄为：{{ person.age }}</h2>
    <h2>汽车为：{{ car }}</h2>
    <button @click="changeSum">sum+1</button>
    <button @click="changeName">修改名字</button>
    <button @click="changeAge">修改年龄</button>
    <button @click="changePerson">修改整个人</button>
    <span>|</span>
    <button @click="changeBrand">修改品牌</button>
    <button @click="changeColor">修改颜色</button>
    <button @click="changeEngine">修改发动机</button>
    <button @click="changeCar">修改整个车</button>
  </div>
</template>

<script setup lang="ts" name="App">
import { ref, reactive, shallowRef, shallowReactive } from 'vue'

let sum = shallowRef(0)
let person = shallowRef({
  name: '张三',
  age: 18,
})
let car = shallowReactive({
  barnd: '奔驰',
  options: {
    color: '红色',
    engine: 'V8',
  },
})

function changeSum() {
  sum.value += 1
}
function changeName() {
  person.value.name = '李四'
}
function changeAge() {
  person.value.age += 1
}
function changePerson() {
  person.value = { name: 'tony', age: 100 }
}
/* ****************** */
function changeBrand() {
  car.barnd = '宝马'
}
function changeColor() {
  car.options.color = '紫色'
}
function changeEngine() {
  car.options.engine = 'V12'
}
function changeCar() {
  Object.assign(car, {
    barnd: '奔111111驰',
    options: {
      color: '2222红色',
      engine: '3333V8',
    },
  })
}
</script>

<style scoped>
.app {
  background-color: #ddd;
  border-radius: 10px;
  box-shadow: 0 0 10px;
  padding: 10px;
}
button {
  margin: 0 5px;
}
</style>
